Early Wednesday morning after the raid began, federal agents put brown paper over officer windows to conceal their work.As the agents executed their warrant, no one was allowed in or out of his third floor City Hall Office.

Next door the offices of Aldermen Daniel Solis and Howard Brookins remained opened.

Very small crack in the brown paper bag covering Alderman Ed Burke’s Office at City Hall. There’s a guy in a suit sitting down at a table or desk. pic.twitter.com/DLZ9XEzHPo

Powerful progressives such as Jesus "Chuy" Garcia have placed a bullseye on Burke’s back.

Garcia and allies defeated Burke’s brother Dan in a state House primary in March, and they’re looking to defeat him in the aldermanic election.

Brookins said the timing of the raid, three months before the election, is shocking.

“I listen to the news and I read the paper,” he said. “I didn’t think they did anything this close to an election so it’s shocking to me.”

Gov. Bruce Rauner, who rallies against the corrupt Chicago machine said the investigation is “overdue.”

The impact of the investigation is already felt in the mayoral contest. Operatives with various campaigns have been reaching out linking their opponent to Burke.

The exact nature of the FBI visit to Burke is not known. The alderman was asked if he’s worried about how news of the raid will play in his ward. Burke said 14 ward residents have known him for 50 years and they know they can trust him.